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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/22106

Title: Modelling of Nb influence on phase transformation behaviours from austenite to ferrite in low carbon steels
Authors: Wang, Li
Parker, Sally V.
Rose, Andrew J.
West, G.D.
Thomson, Rachel C.
Keywords: Niobium
Transformation kinetics
Nucleation rate
Solute drag effect
Low carbon steels
Issue Date: 2016
Publisher: © IOP
Citation: WANG, L. ... et al., 2016. Modelling of Nb influence on phase transformation behaviours from austenite to ferrite in low carbon steels. Modelling and Simulation in Materials Science and Engineering, 24 (3), 035016
Abstract: In this paper, a new model has been developed to predict the phase transformation behaviours from austenite to ferrite in Nb-containing low carbon steels. The new model is based on some previous work and incorporates the effects of Nb on phase transformation behaviours, in order to make it applicable for Nb-containing steels. Dissolved Nb atoms segregated at prior austenite grain boundaries increase the critical energy for ferrite nucleation, and thus the ferrite nucleation rate is decreased. Dissolved Nb atoms also apply a solute drag effect to the moving transformation interface, and the ferrite grain growth rate is also decreased. The overall transformation kinetics is then calculated according to the classic Johnson–Mehl–Avrami–Kolmogorov (JMAK) theory. The new model predictions are quite consistent with experimental results for various steels during isothermal transformations or continuous cooling.
Description: Closed access until 17/03/2017.
Sponsor: The authors gratefully thank Tata Steel UK Limited and Loughborough University for funding this work.
Version: Accepted for publication
DOI: 10.1088/0965-0393/24/3/035016
URI: https://dspace.lboro.ac.uk/2134/22106
Publisher Link: http://dx.doi.org/10.1088/0965-0393/24/3/035016
ISSN: 0965-0393
Appears in Collections:Closed Access (Materials)

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